fix typos in HISTORY

Author: Red-Portal

HISTORY.md

@@ -17,7 +17,7 @@ For instance, for ELBO maximization algorithms, `estimate_objective` will return
 
 ## Behavior Change
 
-In addition, `KLMinRepGradDescent`, `KLMinRepGradProxDescent`, `KLMinScoreGradDescent` will now throw a `RuntimException` if the objective value estimated at each step turns out to be degenerate (`Inf` or `NaN`). Previously, the algorithms ran until `max_iter` even if the optimization run has failed.
+In addition, `KLMinRepGradDescent`, `KLMinRepGradProxDescent`, `KLMinScoreGradDescent` will now throw a `RuntimeException` if the objective value estimated at each step turns out to be degenerate (`Inf` or `NaN`). Previously, the algorithms ran until `max_iter` even if the optimization run had failed.
 
 # Release 0.5